Wyo. Stat. § 14-2-603: Denial of paternity.

(a) A presumed father may sign a denial of his paternity. The denial is valid only if:

(i) An acknowledgment of paternity signed, or otherwise authenticated, by another man is filed pursuant to W.S. 14-2-605;

(ii) The denial is in a record, and is signed, or otherwise authenticated, under penalty of perjury; and

(iii) The presumed father has not previously:

(A) Acknowledged his paternity, unless the previous acknowledgment has been rescinded pursuant to W.S. 14-2-607 or successfully challenged pursuant to W.S. 14-2-608; or

(B) Been adjudicated to be the father of the child.